Works with Maxi-Jet 400, 600, 900 & 1200Excellent water movement for reef tanks Works with Sure Grip Magnet Holders Works with original Maxij-Jet Brackets Fish love the extra water movement Fully adjustable flow direction Nice, wide gentle water flow No more dead spots Very cost effectiveApproximate gallons per hour Maxi-Jet 400 - 1300 GPH Maxi-Jet 600 - 1400 GPH Maxi-Jet 900 - 1600 GPH Maxi-Jet 1200 - 2100 GPH (large propeller) Above picture shows what the completed upgrade would look like on a maxijet and a SureGrip magnet. See below for links to the pumps and magnets you can use with it. Below is a picture of 2 pumps running off just one SureGrip magnet.